I just think heavy metal is a poor genre in general to showcase anything that's Hi-Fi (other than to show how efficient a pair of speakers may be).

I know there's a lot of ho-hum stuff or metal albums with dodgy mixes at in-your-face compression levels but there are also some thoughtfully executed examples with heavy metal elements such as the releases from Dream Theatre for example. They are cleverly written, skillfully played and attention is paid to detail so it's not always true.